<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app1">
        {{title}}
    </div>
    <div id="app2">
        {{title}}
    </div>
    <script>
        var Vue2 = Vue.extend({
            data(){
                return {
                    title:'helo'
                }
            }
        });
        var vm1 = new Vue({el:'#app1'});
        var vm2 = new Vue2({el:'#app2'});
    </script>
</body>
</html>